Franz schwengers



UNITED STATES PATENT OFFICE.-

FRANZ SOHWENGERS, OF UERDINGEN, PRUSSIA, GERMANY.

\ MANUFACTURE OF SUGAR.

GPECIPICATION forming part of Letters Patent No. 345,810, dated July 20,1886.

(No specimens.)

To aZZ whom it may concern:

Be it known that I, FRANZ SOHWENGERS, a resident of the city ofUerdingen, in the Kingdom of Prussia and German Empire, have inventedcertainlmprovements in the Manufacture of Sugar, of which the followingis a specification.

My invent-ion relates to an improved process for the desaccharificationof molasses and sugar-sirups, and the simultaneous production ofoxalatcs from the salts contained therein. It is based upon the twofacts, first, that molasses and sugar-sirups are perfectly soluble inconcentrated methyl alcohol or wood-spirit; and, second, that ontreating this solution with alcohol and oxalic acid the salts containedin the molasses are separated therefrom, together with the sugar in theform of oxalatcs, leaving the organic acids and nitrogenous constituentsin the solution.

The process based on these facts, and constituting the presentinvention, is essentially as follows: The molasses or sugar-sirups to betreated are mixed with methyl-alcohol or a mixture of methyl-alcohol andethyl-alcohol in such proportion that the molasses become dissolved anddo not separate as molasses again in the subsequent operations. For thispurpose, by way of example, it would be sufficient to add to about onehundred and ten pounds of molasses, having a polarization of about fiftyper cent., seven pints of methyl-alcohol. The perfectly-dissolvedmolasses thus obtained is mixed with oxalic acid dissolved in alcohol,and an excess of ethyl-alcohol is then added.

The quantity of oxalic acid employed will de- The precipitate, separatedby pressure from the liquid, is dissolved in water, and by a furtheraddition of alcohol the oxalatcs are obtained by themselves as aprecipitate, while the sugar remains in solution. oxalic acid remainingin the sugar solution are precipitated by lime.

The separation of the alcohol and sugar is effected in the known manner.

The special advantage of the above described process consists, inaddition to its great simplicity, in the avoidance of any loss of sugarin aqueous or diluted alcohol solution by the use of methyl-alcohol assolvent in a concentrated form, while a sngar-sirup is obtained from theliquors having a coefficient of purity of over 99, so that the yield ofsugar amounts to over eighty per cent. of the pure sugar contained inthe molasses. In addition, the oxalatcs obtained as icy-products have aconsiderable commercial value as substances applicable in variousmanufactories.

Having thus described my invention, and also the manner how to performit, what I claim, and desire to get granted by Letters Patent of theUnited States, is

The process for the desaccharifieation of mo lasses and sugar-sirupswith simultaneous production of oxalatcs from the salts containedtherein, consisting in dissolving the molasses or sugar-sirups inmethyl-alcohol or in a mix ture of methyl and ethyl alcohol, convertingthe salts of the molasses into oxalatcs by the addition of oxalic aciddissolved in alcohol, and then separating the oxalatcs by the additionof an excess of ethyl-alcohol, substantially as herein described.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

FRANZ SOHWENGERS.

WVitnesses:

Mano M. ROTTEN, B. ROI.

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